Question

In: Physics

A student on a piano stool rotates freely with an angular speed of 3.05 rev/s ....

A student on a piano stool rotates freely with an angular speed of 3.05 rev/s . The student holds a 1.25 kg mass in each outstretched arm, 0.749 m from the axis of rotation. The combined moment of inertia of the student and the stool, ignoring the two masses, is 5.53 kg⋅m2 , a value that remains constant.

Part A

As the student pulls his arms inward, his angular speed increases to 3.65 rev/s . How far are the masses from the axis of rotation at this time, considering the masses to be points?

Part B

Calculate the initial kinetic energy of the system. ( make sure to round your answer to 3 significant figures)

Part C

Calculate the final kinetic energy of the system.( make sure to round your answer to 3 significant figures)

Solutions

Expert Solution

genius_generous answered 2 years ago
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